It's early days though, (among the rapid increase in numbers), as people move and instances get discovered and linked the best communities for everyone will rise.. Might not be just one though... To keep the football community example, there could be a good instance for match treads, but another could be great for championship clubs or non league or whatever... Fragmentation or choice? :)

That could explain the limits today and changing APIs, blocking Nitter and users not logged in...